SOURCE

var wlList = ['syd','szt','yywl'];
var date = new Date();
var year = date.getFullYear();
var month = date.getMonth() + 1;
var day = date.getDate();
if(month < 10) month = '0'+ month;

for(var i=0;i<10;i++) {
    let rand = Math.floor(Math.random()*(1000-9999))+9999;
    console.log("单号"+(i+1)+":" + wlList[Math.floor(Math.random()*wlList.length)]+year+month+""+day+""+rand)
}